The phrase "a further group of" is correct and usable in written English.
It can be used when referring to an additional set or category of items, people, or concepts that are being discussed or analyzed.
Example: "In addition to the initial findings, a further group of participants was surveyed to gather more comprehensive data."
Alternatives: "an additional group of" or "a supplementary group of".
The Home Office has already said it would allow a further group of 400 students to complete their courses.
A further group of persecutors then put four more 9mm bullets, at point-blank range, into his back, smashing his pelvis, spinal nerves and abdomen.
"Obviously there are a further group of bodies – the ambulance service, the fire service and West Midlands Police – who had a role in the aftermath.
A further group of hotels will be elevated to five-star status in 2010, and Courchevel expects its three properties to be among them.
So we have more legislation to convert a further group of schools into academies and new targets for the number of young people who will be expected to take the English baccalaureate.
According to French authorities they will be followed by a further group of around 10 on Tuesday, all of whom qualify for relocation under the Dublin Regulation because they have family living in the UK.
In Foucault's discourse, he identified a further group of rules serving to control language: none may enter into discourse on a specific subject unless he or she is deemed qualified to do so.
Google won't say exactly how many explorers it has but the first part of the programme signed up 2,000 developers and the second a further group of 8,000 chosen from those who wrote the best tweets and status updates with ideas for using Glass.
But there is a further group of arguments to the same incompatibilist end.
A further group of aminocoumarins are the simocyclinones which bind simultaneously to two different sites of gyrase and show a completely new mode of inhibition.
To assess the impact of the cigarette design modifications on HS yields, a further group of Canadian smokers was recruited for smoking the modified version of 10 products previously assessed.
